Re: M1A1 barrel
No, but we did have an M14 in 'Nam that had been run over by an Amtrac, bending the barrel beyond the gas cylinder. The Armorer chopped the barrel off about 1" beyond the cylinder, cut off the butt stock, installed a selector, and it went into the bush as a spray 'n pray. As a subgun, it was just barely better than nothing. Always malf'ing. I would never do anything like that to an M14 (or M1A) that I actually liked.
M1A1, yep it's a Tommy. Lotta folks mislabel an M1A as an M1A1.
Greg